Classifying door for power shovels



NOV. 14, 1933. w A c s 1,935,288

CLASSIFYING DOOR FOR POWER SHOVELS Original Filed May 29, 1951 2 Sheets-Sheet l Imrenlor NOV. 14, 1933. w A. c s N 1,935,288

CLASSIFYING DOOR FOR POWER SHOVELS Original Filed May 29, 1931 2 Sheets-Sheet '2 f n 1 X F T J J l /7 h r L K 0 4 ,0 "WM 4/, lnvenlors 7V? 7 ENE/rm $3 fimwi izw 1c from the shovel.

Patented a 14,1933

* issazss :oLAssrFnNo noon FOR rowan snovni sf Walter A. Erickson, Monte Vi'sta,-Colo., assignor- I of one-half to Alexander T. Erickson, Monte' f -Vista, Colo.

' Application May 29, 1931, Serial No. 541,003

- Renewed May 16, 1933 2 Claims.

This invention relates broadly to power shovels, suchas are used in placer mines, and other work of similar nature, as for example excavating andthe like.

A primary object of this invention is to provide an auxiliary door which may be termed a classifier door, the purpose of the door being to separate the coarse from the finer material so thatthecoarse material may be dispensedwith subsequent to the discharge of the finer material Other objects and advantages of the invention will become apparent from a study of the following description, taken in connection with the accompanying drawings wherein: I

tional power shovel, parts being broken away to show the application of my invention thereto.

Figure 2 is a top plan View of the auxiliary bore classifying door. 7 e Figure 3 is a transverse sectional elevational view taken substantially on the line 33 of Figure 2.

Figure 4 is a longitudinal sectional elevational view through the auxiliary or classifying door.

With reference more in detail to the drawings, it will be seen that the improved auxiliary or classifying door comprisesa frame 5 of the desired shape and dimensions, opposite side members of which frame are connected by parallel transverse ribs 6 and 7.

Alternate ribs, that is the ribs 7 have oppositely inclined upper edges Smerging atjtheir inner ends to a substantially horizontal edge .9. As suggested in Figure 4., the ribs 7 project upwardly beyond the plane of the upper faces of the. ribs 6, and these ribs '7 serve to provide against block- 7 ing of the openings between the ribs, and also of the frame 5. I 10 are pivetally engaged with the pivot bolt 11 serve as strengthening means for the auxiliary door. The endmost ribs 7 at their rear ends merge into substantially V-shaped hinge eyes 10 that extend rearwardly beyond the rear'side member The free ends of the hinge eyes usually provided for theswinging closure or door 12 of a conventional power shovel designated generally by the reference character 13. (See- Figure 1.)

The intermediate rib 7 has its lower portion substantially rectangular in cross section as shown in Figure 4, and through said lower por-' tion extends a longitudinal bore for slidabl y accommodating the shank i l that at its forward end is equipped with a beveled latch 15 engage able with a suitable keeper recess provided in a Wall of the shovel 13 as will be hereinafter more fully described. The said intermediate rib '7 at its rear end is counterbored for accommodating a coupling socket lfi'threadedly engaged with the Figure 1 is a side elevational view of a conven-' claims.

(on. 209419) p j rear end of the bolt 14. The socket 16' is provided on one end-of a flexible cable 17 which may be operated in any suitable manner for etracting and projecting the latch member 15.

In actual practice, and as shown in Figure 1,

the auxiliary or classifying door being hingedly mounted through the medium of the hinge eyes 10 and the'hinge .bolt 11 serves as an auxiliary closure for the opening 13a of the power shovel. The auxiliary door when in a closed'position fits inwardly of the shovel from the opening 13a and-is retained in said closed position by reason of the latch member 15 engaging a keeper recess provided in the forward wall of the shovel 13 as suggested'in Figure' l. Thus it will be seen that the usual door 12 of the shovel may readily swing to an open or closed position with respect. to the opening 13 Without interference by the auxiliary door constructed in accordance with the present invention.

A power shovel equipped with an auxiliary door as just describechmay be operated in the usual manner and upon opening of the usual door 12 of the powershovel, the finer contents of the shovel will discharge therefrom passing between the ribs 6 and 7 of the auxiliarydoor 5.

The coarser material will be retained in the' shovel through the medium of the auxiliary door 5 to be later discharged from the shovel into a suitable hopper or receptacle provided therefor.

The discharge of the coarser material from the to the right in Figure 1 on the cable 17 thus retracting thelatch 15 permitting the auxiliary door to bring about its pivot to an open position through the opening 13a.

' shovel may be effected by pulling rearwardly or.

Thus it will be seen that I have provided'an V auxiliary door for power shovels, that can be applied to the power shovel without requiring;

any material alterations in the same, and which will operate for the purpose intended without in any wise interfering with the usual door of the shovel. p

Even though I have described and shown herein the preferred embodiment of the invention, it is to be understood that the same is sus-' ceptible of changes, modifications and improvements coming within the scope of the appended.

Having thus described my invention, what I claim as new is:

1. In a classifying door'forpower shovels, a frame, a plurality of spaced parallel ribs connected to the sides of the frame, certain of said .ribsrising above the plane of the upper faces of the-remaining ribs, said certain ribs having upwardly projecting extensions of maximum depth intermediate the ends thereof and being tapered toward the end thereof to constitute a 120 means to hold the larger particles in spaced relation to the remaining ribs, thereby allowing smaller particles to pass between the ribs, and attaching means for the frame.

2. In a classifying door for power shovels, a frame, a plurality of spaced parallel ribs connected to the sides of the frame, certain of said.

ribs rising above the plane of the upper faces of the remaining ribs, said certain ribs having upwardly projecting extensions of maximum depth intermediate the ends thereof and being 

